Datasheet

MAX8795A
TFT-LCD DC-DC Converter with
Operational Amplifiers
8 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3V, V
MAIN
= V
SUP
= 14V, V
PGND
= V
AGND
= V
BGND
= 0V, I
REF
= 25µA, T
A
= 0°C to +105°C. Typical values are at T
A
= +25°C,
unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GATE-ON LINEAR-REGULATOR CONTROLLER
FBP Regulation Voltage V
FBP
I
DRVP
= 100µA 1.231 1.250 1.269 V
FBP Fault Trip Level V
FBP
falling 0.96 1.00 1.04 V
FBP Input Bias Current I
FBP
V
FBP
= 1.25V -50 +50 nA
FBP Effective Load-Regulation
Error (Transconductance)
V
DRVP
= 10V, I
DRVP
= 50µA to 1mA -0.7 -1.5 %
FBP Line (IN) Regulation Error I
DRVP
= 100µA, 2.5V < V
IN
< 6V ±1 ±10 mV
DRVP Sink Current I
DRVP
V
FBP
= 1.1V, V
DRVP
= 10V 1 5
mA
DRVP Off-Leakage Current V
FBP
= 1.4V, V
DRVP
= 34V 0.01 10 µA
Soft-Start Period t
SS
14 ms
Soft-Start Step Size
V
REF
/
128
V
GATE-OFF LINEAR-REGULATOR CONTROLLER
FBN Regulation Voltage V
FBN
I
DRVN
= 100µA, V
REF
- V
FBN
0.984 1 1.015 V
FBN Fault Trip Level V
FBN
rising 340 420 510 mV
FBN Input Bias Current I
FBN
V
FBN = 0.25V
-50 +50 nA
FBN Effective Load-Regulation
Error (Transconductance)
V
DRVN
= -10V, I
DRVN
= 50µA to 1mA 11 25 mV
FBN Line (IN) Regulation Error I
DRVN
= 0.1mA, 2.5V < V
IN
< 6V ±0.7 ±5 mV
DRVN Source Current I
DRVN
V
FBN
= 300mV, V
DRVN
= -10V 1 5 mA
DRVN Off-Leakage Current V
FBN
= 0V, V
DRVN
= -25V -0.01 -10 µA
Soft-Start Period t
SS
14 ms
Soft-Start Step Size
(V
REF -
V
FBN)
/
128
V
POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES
DEL Capacitor Charge Current During startup, V
DEL
= 1V 4 5 6 µA
DEL Turn-On Threshold V
TH
(
DEL
)
1.19 1.25 1.31 V
DEL Discharge Switch
On-Resistance
During UVLO, V
IN
= 2.0V 20 Ω
CTL Input Low Voltage V
IN
= 2.5V to 5.5V 0.6 V
CTL Input High Voltage V
IN
= 2.5V to 5.5V 2 V
CTL Input Leakage Current CTL = AGND or IN -1 +1 µA
CTL-to-SRC Propagation Delay 100 ns
SRC Input Voltage Range 36 V
V
DEL
= 1.5V, CTL = IN 200 300
SRC Input Current I
SRC
V
DEL
= 1.5V, CTL = AGND 115 200
µA
S RC - to- C O M S w i tch On- Resi stance R
SRC
(
ON
)
V
DEL
= 1.5V, CTL = IN 5 12 Ω
D RN- to-C OM S w i tch On- Resi stance R
DRN
(
ON
)
V
DEL
= 1.5V, CTL = AGND 30 70 Ω